How's about a Socket 3 ~266MHz 45nm 486 core with 2MB of L2 cache and SSE3 bolted on? That would be fun to play with.

Or how about an entire Core M SoC (system on a cartridge) designed for Slot 1 boards? The cartridge would house the CPU, any necessary VRM, and memory/bus translation logic to enable the Core M's IMC to interface with the BX northbridge. Now that would max out a V5-5500 with ease, allow you to run ISA sound cards, and work with modern SSE2 applications, all on your trusty P3B-F! Memory bandwidth would be a huge bottleneck, but it would still smoke any Tualatin.

I want a 3-core CPU that plugs into any old cheap P4 mobo.
1 core of x86_64.
1 core of PowerPC G5.
1 core of ARM.
Runs everything.

...Actually make it 2 cores of each.

AMD: 486-160 (4x40) but not needing a fan plus 32MB cache and one hell of an FPU. Basically all programs run in super crazy fast cache.

Motorolla: 68040-80 same as above. Don't think they ever made clock doubled 040's

Using new processes you should be able to do the above easily and still make them work in old motherboards. Kept the speeds down so software doesn't crash.

A 500 MHz socket-3-compatible chip, bonus points if it's based on the Cyrix 5x86. 😀

To be honest in this day and age it's a goal probably achievable even by an advanced hobbyist. Using FPGAs and cleverly written HDL. I've been toying with the idea for a while. One major obstacle is that none of today's FPGAs that are big enough to contain this, is 5V-compatible (and many are not even 3.3V-compatible) so a lot of ancillary buffer chips would be required.

For Intel? Release the 266 and 300MHz Pentium MMX processors for S7. Also, 233-433MHz Pentium Pro style PII with your choice of 512K or 1MB of full speed on package (MCM) L2 would be pretty cool to play with, or maybe Pentium M processors made to work in vanilla mPGA 478 boards.

For AMD? A speed bump to the top end S939 Opteron and Athlon FX processors. Top 'em out at 2.8GHz like the single core FX-57. Also a dual core K7 Tbird/Palomino would be pretty awesome.

Others? I second clock doubled 68040 (or tripled) 68060 processors.

Pentium 3 Xeon 2MB cpus would be awesome 😁

AMD slot A or Super Socket 7 cpus 😀

Or something really crazy for socket 462!

All of you who want a clocked-up, hotted up 486 should check out embedded / industrial PCs. Pretty sure the early Vortex86 chips were essentially that. They added some P5 instructions and even MMX+3DNow later on but the core was more-or-less 486 at 300-600 MHz.

You can get those on PC/104 boards commonly which are bog-standard ISA, so there you go.

Also the early AMD Geodes were based on the MediaGX, which was based on the Cyrix 5x86. Figure that out.

Revamped dual core socket 462 chip featuring all the P4 6-series instruction sets and features, clocked at 4ghz (on todays 28nm process it would be feasible) and 2mb l2 cache per core. With a new chipset to go along with it! IDE, floppy, all the legacy stuff of course. Plus Tri- channel DDR400 maybe for something off the wall? Sata III for SSD performance and USB 3.1 of course 😀 also an unlocked multiplier and the option to disable a core with software in the OS would be great.
Imagine a system that would be comfortable booting into anything from Win2k to Windows 10.

I'd love to see a 4GHz version of the Pentium Classic, complete with the necessary logic to work perfectly on a regular Socket 7 board. Pointless? Sure. Idiotic? Probably. Perfect for the 25th anniversary of the Pentium? All of my yes.

xjas wrote:

All of you who want a clocked-up, hotted up 486 should check out embedded / industrial PCs. Pretty sure the early Vortex86 chips were essentially that. They added some P5 instructions and even MMX+3DNow later on but the core was more-or-less 486 at 300-600 MHz.

You can get those on PC/104 boards commonly which are bog-standard ISA, so there you go.

Also the early AMD Geodes were based on the MediaGX, which was based on the Cyrix 5x86. Figure that out.

Interesting on the PC/104, any examples?

Motorola... some 68060s... There are simply not enough out there! 😵

Intel made a prototype super-low-power Pentium on 32nm a few years ago, and ran it on a Asus T2P4. 9.5mW at 66mhz, ~.6w at 740mhz.

http://semiaccurate.com/2011/09/28/intel-sola … lly-impressive/
https://semiaccurate.com/2012/12/20/intel-exp … -solar-pentium/